Structure Of Neutron‐Rich Nuclei In A∼100 Region Observed In Fusion‐Fission Reactions
作者:
C. Y. Wu,
H. Hua,
D. Cline,
A. B. Hayes,
R. Teng,
R. M. Clark,
P. Fallon,
A. Go¨rgen,
A. O. Macchiavelli,
K. Vetter,
期刊:
AIP Conference Proceedings
(AIP Available online 1903)
卷期:
Volume 656,
issue 1
页码: 408-415
ISSN:0094-243X
年代: 1903
DOI:10.1063/1.1556672
出版商: AIP
数据来源: AIP
摘要:
Neutron‐rich nuclei around A∼100 were populated as fission fragments produced by the238U(&agr;,f) fusion‐fission reaction. The deexcitation &ggr; rays were detected by Gammasphere in coincidence with the detection of both fission fragments by the Rochester 4&pgr; heavy‐ion detector array, CHICO. This technique allows Doppler‐shift corrections to be applied for the observed &ggr; rays on an event‐by‐event basis thus establishing the origin of &ggr; rays from either fission fragment. In addition, it allows observation of &ggr;‐ray transitions from states with short lifetimes and offers the opportunity to study nuclear species beyond the reach of the spontaneous fission process. With these advantages, one can extend the spectroscopic study to higher spins than those derived using the thick‐target technique, and to more neutron‐rich nuclei than those derived from spontaneous fissions. Among the new and interesting phenomena identified in this rapid shape‐changing region, the most distinct result is the evidence for a prolate‐to‐oblate shape transition occurring at116Pd, which may have important implications to our understanding of the shell structure for neutron‐rich nuclei. © 2003 American Institute of Physics
点击下载:
PDF
(129KB)
返 回